libos (arch/lib) emulates a sysctl-like interface by a function call of
userspace by enumerating sysctl tree from sysctl_table_root. It requires
to be publicly accessible to this symbol and related functions.
Signed-off-by: Hajime Tazaki <tazaki@xxxxxxxxxxxxxx>
---
fs/proc/proc_sysctl.c | 36 +++++++++++++++++++-----------------
1 file changed, 19 insertions(+), 17 deletions(-)
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index f92d5dd..56feec7 100644
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -35,7 +35,7 @@ static struct ctl_table root_table[] = {
},
{ }
};
-static struct ctl_table_root sysctl_table_root = {
+struct ctl_table_root sysctl_table_root = {
.default_set.dir.header = {
{{.count = 1,
.nreg = 1,
@@ -77,8 +77,9 @@ static int namecmp(const char *name1, int len1, const char *name2, int len2)
}
/* Called under sysctl_lock */
-static struct ctl_table *find_entry(struct ctl_table_header **phead,
- struct ctl_dir *dir, const char *name, int namelen)
+struct ctl_table *ctl_table_find_entry(struct ctl_table_header **phead,
+ struct ctl_dir *dir, const char *name,
+ int namelen)
{
struct ctl_table_header *head;
struct ctl_table *entry;
@@ -300,7 +301,7 @@ static struct ctl_table *lookup_entry(struct ctl_table_header **phead,
struct ctl_table *entry;
spin_lock(&sysctl_lock);
- entry = find_entry(&head, dir, name, namelen);
+ entry = ctl_table_find_entry(&head, dir, name, namelen);
if (entry && use_table(head))
*phead = head;
else
@@ -321,7 +322,7 @@ static struct ctl_node *first_usable_entry(struct rb_node *node)
return NULL;
}
-static void first_entry(struct ctl_dir *dir,
+void ctl_table_first_entry(struct ctl_dir *dir,
struct ctl_table_header **phead, struct ctl_table **pentry)
{
struct ctl_table_header *head = NULL;
@@ -339,7 +340,7 @@ static void first_entry(struct ctl_dir *dir,
*pentry = entry;
}
-static void next_entry(struct ctl_table_header **phead, struct ctl_table **pentry)
+void ctl_table_next_entry(struct ctl_table_header **phead, struct ctl_table **pentry)
{
struct ctl_table_header *head = *phead;
struct ctl_table *entry = *pentry;
@@ -670,7 +671,8 @@ static int proc_sys_readdir(struct file *file, struct dir_context *ctx)
pos = 2;
- for (first_entry(ctl_dir, &h, &entry); h; next_entry(&h, &entry)) {
+ for (ctl_table_first_entry(ctl_dir, &h, &entry); h;
+ ctl_table_next_entry(&h, &entry)) {
if (!scan(h, entry, &pos, file, ctx)) {
sysctl_head_finish(h);
break;
@@ -828,7 +830,7 @@ static struct ctl_dir *find_subdir(struct ctl_dir *dir,
struct ctl_table_header *head;
struct ctl_table *entry;
- entry = find_entry(&head, dir, name, namelen);
+ entry = ctl_table_find_entry(&head, dir, name, namelen);
if (!entry)
return ERR_PTR(-ENOENT);
if (!S_ISDIR(entry->mode))
@@ -924,13 +926,13 @@ failed:
return subdir;
}
-static struct ctl_dir *xlate_dir(struct ctl_table_set *set, struct ctl_dir *dir)
+struct ctl_dir *ctl_table_xlate_dir(struct ctl_table_set *set, struct ctl_dir *dir)
{
struct ctl_dir *parent;
const char *procname;
if (!dir->header.parent)
return &set->dir;
- parent = xlate_dir(set, dir->header.parent);
+ parent = ctl_table_xlate_dir(set, dir->header.parent);
if (IS_ERR(parent))
return parent;
procname = dir->header.ctl_table[0].procname;
@@ -951,13 +953,13 @@ static int sysctl_follow_link(struct ctl_table_header **phead,
spin_lock(&sysctl_lock);
root = (*pentry)->data;
set = lookup_header_set(root, namespaces);
- dir = xlate_dir(set, (*phead)->parent);
+ dir = ctl_table_xlate_dir(set, (*phead)->parent);
if (IS_ERR(dir))
ret = PTR_ERR(dir);
else {
const char *procname = (*pentry)->procname;
head = NULL;
- entry = find_entry(&head, dir, procname, strlen(procname));
+ entry = ctl_table_find_entry(&head, dir, procname, strlen(procname));
ret = -ENOENT;
if (entry && use_table(head)) {
unuse_table(*phead);
@@ -1069,7 +1071,7 @@ static bool get_links(struct ctl_dir *dir,
/* Are there links available for every entry in table? */
for (entry = table; entry->procname; entry++) {
const char *procname = entry->procname;
- link = find_entry(&head, dir, procname, strlen(procname));
+ link = ctl_table_find_entry(&head, dir, procname, strlen(procname));
if (!link)
return false;
if (S_ISDIR(link->mode) && S_ISDIR(entry->mode))
@@ -1082,7 +1084,7 @@ static bool get_links(struct ctl_dir *dir,
/* The checks passed. Increase the registration count on the links */
for (entry = table; entry->procname; entry++) {
const char *procname = entry->procname;
- link = find_entry(&head, dir, procname, strlen(procname));
+ link = ctl_table_find_entry(&head, dir, procname, strlen(procname));
head->nreg++;
}
return true;
@@ -1098,7 +1100,7 @@ static int insert_links(struct ctl_table_header *head)
if (head->set == root_set)
return 0;
- core_parent = xlate_dir(root_set, head->parent);
+ core_parent = ctl_table_xlate_dir(root_set, head->parent);
if (IS_ERR(core_parent))
return 0;
@@ -1479,7 +1481,7 @@ static void put_links(struct ctl_table_header *header)
if (header->set == root_set)
return;
- core_parent = xlate_dir(root_set, parent);
+ core_parent = ctl_table_xlate_dir(root_set, parent);
if (IS_ERR(core_parent))
return;
@@ -1488,7 +1490,7 @@ static void put_links(struct ctl_table_header *header)
struct ctl_table *link;
const char *name = entry->procname;
- link = find_entry(&link_head, core_parent, name, strlen(name));
+ link = ctl_table_find_entry(&link_head, core_parent, name, strlen(name));
if (link &&
((S_ISDIR(link->mode) && S_ISDIR(entry->mode)) ||
(S_ISLNK(link->mode) && (link->data == root)))) {
--
2.1.0
--
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